Coverage of Tea Leaf Surfaces with Spray Material Applied with Mist Blower and Knapsack Sprayer

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概要

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• 1. In April, 1954, a test was made with portable mist blower and knapsack sprayer for coverage of foliage of tea bushes in the first-flushing stage.<BR>2. 0.4 per cent Bordeaux mixture was applied with both sprayers at a rate of 130 gals. per acre, and 1.2 per cent mixture was sprayed with mist blower at a rate of about 43 gals. per acre.<BR>3. After the bushes dried up, young and old leaves were sampled from each plot, and were pressed between filter papers treated with potassium ferrocyanide solution. Copper deposit on the leaf surfaces was demonstrated by bronzing of filter papers.<BR>4. Lower surfaces of young leaves were covered more satisfactorily by blower spray than those of old leaves. By spraying with knapsack sprayer the lower surfaces were poorly covered irrespectively of leaf age. Upper surfaces were throughly covered in every case.<BR>5. Distribution of deposit on leaf surfaces seemed better when sprayed with mist blower, especially when small amount of concentrated spray was applied.<BR>6. However, data were too few to evaluate the control effect in favor of spraying with mist blower.<BR>7. No difference in the deposition of spray material was observed between the top and side leaves of tea bushes.<BR>8. Tea foliage was not injured by spraying with concentrated Bordeaux mixture.<BR>9. In view of several other advantages, it is suggested that mist blower will be useful in future for control of the pests and blights of tea bushes.

• 日本茶業技術協会の論文

日本茶業技術協会 | 論文

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